Type-writer.



PATENTE-D JULY 28, 1909.

v2 SHEETS-SHEET 1.

meses. I

WSQM' 310.994,769. PATENTED JULY'zs, 1908. I

E. L. WOOD.

TYPE WRITER.

APPLIOATION FILED JULY 13,1907.

2 SHEETS-SHEET Z.

D@ v I. Q y inw M Sm s tension spring, and duringthe latterpart of the stroke the momentum of the type bearing bar itself will' be suflicient to store power frame 'ful Type-Writer, of .which the foil-'owing isa "typefwriter of the class known ast `parts of the device,whereby the objects confyifeferring to.- the accompanying, Ihave used thel referencenumeral y cate the part of thev typewriter frame shown ELBERT L; Woon, or NEVADA, io'wA.

TYPEQwnrrnn.

Patented July 28,\1908.

To all whamit may concern: I

Be it known that I, ELBERT L. WOOD, a citizen of the United States, residing' at'Nevada, in the county of Story and State of Iowa', have invented a certain new and usespecificati'on.

The object of my invention'is to rovide a ble writing.,`machine, in which the type bearing bars are s o arranged that all of them may befreturned automatically a single spring, to therebyrovide a uniform tension for each key, and) to simplify and cheapen the construction; i j A further object is to'fprovide a device of this v'kind that will have a comparatively light touch, for the reason that each'type bearing. bar will move through the greaterportion of its stroke Without engaging or aecting the in the tension spring for returning the type bearing bar.

My invention'consists in the construction,

combination and arrangement ofthe various templated are attained, `as hereinafter more fully set forth, pointed out in my claims, and illustrated in the accompanying drawings,in

Figure 1 shows a plan View of a part of a tyiawriter embodying my invention, some of the type. bearing bars, keys, and other. parts being omitted in order to clearly illustrate the essential features of my invention; Fig. 2 shows a vertical,` central sectional view through the typewriter frame, showing the platen and one of the'typ'ebearing bars, andthe mechanism for actuatingit. The dotted lines inthis figure show the position of the type bearingbar wheny in contact with the platen. Fig.` '3 -shows a detail view iilustrating 4the means for attaching the guide of the rack levers to the typewriterj frame, and Fig. 4 shows a detail'view'illnstrating the guide device for centering the bearing bars when they strike the platen.

drawings, 10 to indie visie by means of dotted lines in Fig. 2.

yA series of key bars 11 are fulcrumed to the-- rear ofthe frame, and are provided with the keys '12 at their forward ends. A spacing bar 13i`s mounted at the forward end of the typewriter frame, and is provided' with two levers 114 at its sides, which levers are-pivoted at their rearends to the rod-15, which rod also supports the'levers 11.

The reference platen `of ordinaryl construction.

Formed on each side of the typewriter frame., near its central' portion, are thelugs` 17,.des1gned to receive the ends of a guide,v 'frame 18, The central portion of the guide frame is of segmental sha e, vas cleariy shown in Fig, 1, and is forme with'a series of notches 19. `Arranged in each of said notchesisa rack lever `20,` pivotally connected with the frame '18V by means of the through the levers 20. At the to' 'of each of the levers 2.,()` isa `segmental rac 22, and at the lower end vofeach lever is Ia forwardly projecting arm '23. .These arms 23 are conf nected with thekey levers 11 by means of the rods'24, each of which is preferably provided with aturn buckle 25. In this way, a depression'of any of the ke vs 12 will cause its rack 22 to move forwardly,v

Pivoted tothe reariof the frame are two arms 26, at opposite sides ofthe machine, said arms being extended forwardly to about the center of the machine. They are connected with the segmental bar 27, which eX- tends across the machine, `as clearly shown in Fig. 1, directly under thearms 23 of the levers 20. At theends of thesegmental bar 6o numeral 16 indicates aV rod l21 passed through the frame, and

as shown by` 27 are the lateral extensions 28, cach end being connectedby a rod 29 with one of the levers 14, of thespacing bar. this way, the depression of a spacing bar will operate to also depress the segmental bar 27l The mechanism for 'advancing-the platen upon a depression of any of the key bars, or 'the `spacin Abanlforms no part of my present invention,

and is therefore not illustrated or v"described, Ait being understood that I lmayl employ any of the ordinary devices n'ow in Y common use for this purpose;l

In order that' a uniform tension may be appliedto j yall rof j the key .bars, I provide a 'the machine, said guide frame havingat its lcentral portion a rearwardly projecting arm-- 31," having at its top a V sha ed ,centering v guide 32, as shown 1n Fig. 4. ixed to this arm 31 is a contractible-coil spring 33, eX- tended downwardly and connected to an arn .434, which' arm isiixed to vthe bar 27, and eX-4 tended rearwardly for the purpose of receiving the spring 33. A turn buckle 35 isprovided. for said s rin ,whereby its tension maybe adjuste T e guideframe 30 has its` central portion of segmental form, 'as shown il'r'Fig.A 1, and is provided'with a series of notches designed tov receive the -type bearing bars 36, each of which has a pinion 37 on its end, which pinion rests in a notch in the frame 30, and is in mesh with the correspond- 4 ing'rack 22. .A curved sup ort 38 is rovided for the 4forward ends o the type ars 36, and 'each of the type'bars is yof such shape that when in printing osition, it willenter. the guide-32, so'that the type will be centered accurately on. the platen.I 4

. In practical use, and assuming the parts to be 1n thepositionshown by solid lines in Fig. 2", and,assuming further that an operrst ward movement of the arm 23, and the forward movement of. the rack 22, which will j cause 'the ty e bar 36 to swing upwardly and rearwar y. The pprts are preferably so proportioned that t' 's type bar 36 willv swing u wardly to -a point past a vertical line, before t e arm 23 will strike upon the bar 27, hence this much ofthe movement of the type l bar 36 will be accomplished very easily, and with a slight touch of the` key bar, because said movement is not opposed by any spring,

. and all the power required is just so much as is necessary to raisethe weight of the type bar 36. WhenM the type bar has gone throughA this much of itsvmovement, it willhave, attained a considerable momentunnand hence when the arm 23 strikes upon the bar 27, it will depress saidbar against the tension of the spring 33, and only a comparatively slight pressure ofthe operators finger 1s necessary to complete the movement of the type bar 36,-toward the platen, because of t e momentum of the type-bar. When the bar 27 is depressed against the pressure of the spring 33,--as shown by dotted lines in Fig. 2, then su'ficient power is stored in the spping to instantly elevate the type bar, and t ovv/,it back'fto its normal position, and since there is only one spring for ally of thekey bars, it is obvious that the same amount of tension will be applied to 'each key, and'in this way the printing produced bythe machine will be uniform, as the operator will soonilearn to strike every key with the same pressure. Furthermore, it is obvious that a very sim le and durable construction is provided, w ich will be inexpensive in manu- `facture, and easily keptl in repair.

Having thus described my invention, what I claim and desire to secure by Letters Patent of the United States, therefor, is

1. 41n a typewriter, the combination o'i-a series of pivoted type bars, each having a pinion thereon centered at the pivotal point of the ty e bar, a series of levers, each having a rack' t ereonin mesh with said pinions, a series of key bars operatively connected with said levers,-and a spring actuated tension bar so positioned as to engage each of said levers when it has partially completed its stroke. '2. 1n a typewriter,- the combinationof a series of pivoted t e bars, each-having a pinion centered at t e pivotal point of the type bar, a series of levers, each having a rack thereon, in mesh with said pinions, an arm on each lever, a series of key bars con- 'nected with said arms, a tension bar adjacent to said arms, and so arranged as to be engaged by said arms after the key bars have partially completed their movement, and a yieldingpressure device connected with the tension bar.

3;' In a typewriter, the combintion of a series-of key bars, a segmental frame above thevkey bars, a series of levers mounted therein, each having a forwardly projecting arm at its lower end, and a segmental rack at its upper end, aisecond segmental frame arranged 1n a horizontal plane above the irst, a series of typebearing bars,' each having a pinion mounted inthe upper frame, said pinions in mesh with said rack bars, a rearwardly projecting arm connected with the upper trame, and having a V shaped guide at its rear, -designed to receive said type bearing bars when in printing position, a segmental tension bar arran ed beneath said arms on the levers, and so is osed that the arms may be depressed throug o'ut stroke before engaging said tension bar, and a contractible coil s ring fixed to the upper frame and connectedJ to the tension bar, ar l means forad j listing the tension of said spring.

4. In a typewriter, the combination of a series of key bars, a se mental frame above theke lbars, a series of evers mounted therein, eac having a forwardly projecting arm at its lower end, and a segmental rack at its upper end, a second segmental frame arranged in a horizontal plane above the first, a series of type bearing bars, each having a pinion mounted in the upper frame, said plnions in mesh with said rack bars, a rearwardlyl projecting arm connecte i with the upper frame and having a V shaped guide at its rear, designed to rece've said type. bearin bars 'when in printing position, a segmenta the major part of their tension bar arranged beneath said arms onspring, anda spacing bar connected with said the levers, and so' v 1s osed that the arms may tension bar. be depressedthi'oug out the majo-r part 0f zDes Moines, Iowa', May 6, 1907. j their stroke before engaging said tension bar, v ELBERT L. WOOD.

5 a contractible coil spring fixed to the u per Witnesses:

frame, and connected tothe `tension4 arl, 7 WILLARD' JOHN, means for adjusting the tension of' said 4 v GEO. A. KLOVE.r 

